where \(q_c\)  is a constant obtained by interpolating the data at the critical pressure.
Here also we remark that the exponent \(\mu \)  varies with the the coefficient \(\beta \) .
In figure REF , we report the evolution of this exponent as a function of \(1/\log (\beta )\) . For \(\beta =\alpha =1\)  we have the
obvious limiting value \(\mu =1\) . As \(\beta \)  increases, so does the value of \(\mu \) . By plotting \(\mu \)  against \(1/\log (\beta )\)  we may
estimate the limiting value for \(\beta \rightarrow \infty \) , which is not inconsistent with the value \(\mu =2\) ; the value suggested by Roux
and Herrmann in 1987 [1]}.
<FIGURE>